Xen implementation on CentOS 5.1 allows to utilize pygrub as bootloader for SolarisDomUs, already created by "xm" utility , what significantly simplifies creating runtime profiles for SNV DomUs and also will work for any build of OpenSolaris (76,78,79) regardless of "Bug 633784 checksum offload with Linux dom0 produces invalid checksum", been fixed in build 81.